no respect

So my ex texted me last night wishing that my brother had a happy birthday and that I enjoyed it too... first off, my brother and my ex don't get along. They never have and she never told me she wishes he has a good b-day when we were dating. The last thing I told her before this text was a month ago on the phone (you can see my previous posts from a month ago) was that I wish her the best in her new relationship but I can't be in her life. After that she still requests me on social media, blocks me whenever she changes her mind " etc then this text about the birthday thing last night. I know she could care less about my brother...and I'm not sure if she's doing this to stay relevant in my life, to be selfish or because deep down its her way of showing she cares in her own fucked up way..but I did reply. I said "thank you for that" plain and simple. And the reason why I Replied is because she made me feel so guilty before for "not replying sooner" to her breadcrumbs. Basically she was missing me and was lonely and it only took her two weeks from texting me the "I miss you" text to her getting with another guy and being exclusive, even when I did contact her two days before they were exclusive. But anyways, I replied to give her that window to apologize for how she treated me the last time we talked and during the ending of our relationship and how selfish and confusing she was after the breakup. But nope she just said your welcome. It really shocks me how someone can't see how there in the wrong. And I think her texting me about the birthday thing is either to make herself feel less guilty for dropping me and replacing me with a new guy so soon. Or because she really doesn't think she is wrong and is just terribly self absorbed and missed the point where I told her multiple times that I have no interest staying in her life as a friend.

Honestly guys, did I do the wrong thing by replying and kinda breaking NC by saying "thanks for that" I mean I obviously didn't reply to the your welcome Bullshit and if anything this shows me how delusional she is. And I know the whole point of NC is so you don't lose control over your emotions which is why it's best to stay quiet. But I didn't show her any emotion this time..it was a bland ,thanks text. But the last time we talked she knew how broken I was and how she was hurting me again even after the 30 days NC, which she made me feel guilty for doing.. so I just don't understand why she is trying to keep minimal contact with me when she's in a relationship and knows that it hurts me and that I can't heal if she's around. It's like she doesn't want me to let go fully...idk. I can't wait until I'm over this, it's officially been 3 months since the breakup. Still hurting badly but during my 30 days NC I got breadcrumbs, then when I broke the NC she gave me false hope, and now I feel like she's trying to act like she's done nothing wrong and she can have me and her new bf. But that's where she is wrong. I will not give her my friendship, but I'D be lying if I said I didn't want her to own up to how she handled things, and at least give me a closure apology. But she's too prideful, delusional and only cares when it suits her. Sucks to still be in love with someone who doesn't give two Fucks.